#!/usr/bin/env python
# -*- coding:utf-8 -*-
# Author:Taotie Ren



def isPhoneNumber(text):
	if len(text) != 12:
		return False
	for i in range(0, 3):
		if not text(i).isdecimal():
			return False
	if text[3] != '-':
		return False
	for i in range(4, 7):
		if not text[i].isdecimal():
			return False
	if text[7] != '-':
		return False
	for i in range(8, 12):
		if not text[i].isdecimal():
			return False

	return True

# print('415-555-4242 is a phone number:')
# print(isPhoneNumber('415-555-4242'))
# print('Moshi moshi is a phone number:')
# print(isPhoneNumber('Moshi moshi'))

message = 'Call me at 415-555-1011 tomorrow. 415-555-9999 is my office.'
for i in range(len(message)):
	chunk = message[i:i+12]
	if isPhoneNumber(chunk):
		print('Phone number found: ' + chunk)
print('Done')